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Tohaina

\left(x-y-9\right)\left(x-y+9\right)
Tuhia anō te x^{2}-2xy+y^{2}-81 hei \left(x-y\right)^{2}-9^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).